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At the very least formaldehyde can cause irritation to your eyes and excessive coughing, so if someone around you coughs whilst you're smoking you know what is causing it

They are best equipped to exploit this market opportunity." In fact, the tobacco industry considered getting into the marijuana market in the 1960s and 70s and could easily do so, says Stanton Glantz, a professor at University of California, San Francisco School of Medicine

Pyrolysis is a chemical reaction that is best described as decomposition driven by heat (see Section 12.4.2.1)

You might be more than you think you are. When did you first smoke them